因缺少侏罗纪时期的化石记录,非鸟类兽脚亚目恐龙的早期进化还存在很多疑问.这个问题给鸟类的兽脚类恐龙起源假说造成一个时间悖论,即发现的带有羽毛的恐龙晚于始祖鸟.沈阳师范大学胡东宇和徐星等人合作,研究了一块来自中国辽宁西部晚侏罗 Due to the lack of fossil records in the Jurassic period, there are still many doubts about the early evolution of non-ornithological dinosaurs, a paradox of time that has been found in birds’ ancestral dinosaurs, Of dinosaurs later than Archeopteryx. Shenyang Normal University Hu Dongyu and Xu Xing and others, to study a piece of late Jurassic from western Liaoning